Jinma rebuild questions?

[thetester]

I had freshly rebuild my jinma farm pro 2420 last summer. Had very little hours on it. Checked the oil this spring and it was full of antifreeze.

I tore this thing Down and inspected it with a fine tooth comb. No cracks nada. I added pressure to the coolant side and it seemed to be leaking from around the sleeves.

I got new sleeve orings and they look smallish for a good seal. They are in fact new and correct. I polished up the bore area for sure with steel wool and skotch brite. I put the rings on and added soap. I can seat the sleeves by hand.

This worries me because I had leaking antifreeze from the seals before.

The old orings were not rolled or cut. Just swollen and mushed flat. No sign of why they would leak.

Should I attempt to source fatter or thicker orings for a more press fit??

Opinions and suggestions??

 

[Bob Rooks]

I'd check the concentricity and perpendicular alignment of the block bore against the block deck. Could be that the bore is slightly ovaled.

 

[Bob Rooks]

Also, the liner should not be able to be pressed in just by hand. You probably need slightly larger silicone O-rings and press the liner in with a slotted bar against a headbolt/stud, pressing on a block of wood against the liner. Here is a suggestion for the tool.